🚀 go-pugleaf

The problem we found with this approach is that it is not possible to
check contents when the user exists the textfield. For example a date
or a number.


On Mon, 09 Aug 1999 10:05:07 -0600, David <david.v.clark@lmco.com>
wrote:

>Here is the solution that I am using to restrict the number of characters
>the JTextField allows.  I found it on the java web site and changed the beep
>since it would beep for each JTextfield at the constructor.  Anyway, it
>seems to do the trick.  Hope it helps.
>
>import java.awt.Toolkit;
>import javax.swing.*;
>import javax.swing.text.*;
>
>// An extension of PlainDocument that restricts the length of the content it
>contains
>public class FixedLengthPlainDocument extends PlainDocument {
>       private int maxLength;
>
>    public FixedLengthPlainDocument(int maxLength) {
>           this.maxLength = maxLength;
>    }
>
>    public void insertString(int offset, String str, AttributeSet a) throws
>BadLocationException {
>           if (getLength() + str.length() > maxLength) {
>
>              str = str.substring(0, str.length() - (getLength() +
>str.length() - maxLength));
>              super.insertString(offset, str, a);
>              //Toolkit.getDefaultToolkit().beep();
>           }
>           else {
>                super.insertString(offset, str,a);
>           }
>    }
>}
>
>
>
>David wrote:
>
>> Good day -
>>
>> Using JBuilder 3 -
>>
>> I have several JTextFields that the user types into.  I would like to
>> restrict the number of characters to 10 (for example).  Has anyone done
>> this?  I thought perhaps DocumentListener was the solution, but couldn't
>> get it to work.
>>
>> I would greatly appreciate any help you can offer.
>>
>> David
>